Add WatchConnectivity for bidirectional iOS-Watch sync

Implement real-time sync between iOS and Apple Watch apps using
WatchConnectivity framework. This replaces reliance on CloudKit
which doesn't work reliably in simulators.

- Add WatchConnectivityManager to both iOS and Watch targets
- Sync workouts, splits, exercises, and logs between devices
- Update iOS views to trigger sync on data changes
- Add onChange observer to ExerciseView for live progress updates
- Configure App Groups for shared container storage
- Add Watch app views: WorkoutLogsView, WorkoutLogListView, ExerciseProgressView

Workouts Watch App/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,13 +1,14 @@
 {
-  "images" : [
+  "images": [
     {
-      "idiom" : "universal",
-      "platform" : "watchos",
-      "size" : "1024x1024"
+      "filename": "icon-1024.png",
+      "idiom": "universal",
+      "platform": "watchos",
+      "size": "1024x1024"
     }
   ],
-  "info" : {
-    "author" : "xcode",
-    "version" : 1
+  "info": {
+    "author": "xcode",
+    "version": 1
   }
-}
+}